Which of the following is correct about classifying organisms in science? A
They are classified in a hierarchical system, with the largest group sharing only a few characteristics at the top, and the smallest group sharing the most characteristics at the bottom.

B
They are classified in a numerical system, where the top tier classifies organisms with the largest populations, and the lowest tier classifies organisms with the smallest populations.

C
They are classified in a chronological system, starting with the first organisms discovered by people and through to the most recently discovered organisms.

D
They are classified in a geographical system, where the organisms are listed alphabetically by country, and the countries are ordered by number of organisms they possess.